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Mineralized breccia clasts: a window into hidden porphyry-type mineralization underlying the epithermal polymetallic deposit of Cerro de Pasco (Peru)

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Abstract

Cerro de Pasco (Peru) is known for its large epithermal polymetallic (Zn-Pb-Ag-Cu-Bi) mineralization emplaced at shallow level, a few hundred meters below the paleo-surface, at the border of a large diatreme–dome complex. Porphyry-style veins crosscutting hornfels and magmatic rock clasts are found in the diatreme breccia and in quartz–monzonite porphyry dikes. Such mineralized veins in clasts allow investigation of high-temperature porphyry-style mineralization developed in the deep portions of magmatic–hydrothermal systems. Quartz in porphyry-style veins contains silicate melt inclusions as well as fluid and solid mineral inclusions. Two types of high-temperature (> 600 °C) quartz–molybdenite–(chalcopyrite)–(pyrite) veins are found in the clasts. Early, thin (1–2 mm), and sinuous HT1 veins are crosscut by slightly thicker (up to 2 cm) and more regular HT2 veins. The HT1 vein quartz hosts CO2- and sulfur-rich high-density vapor inclusions. Two subtypes of the HT1 veins have been defined, based on the nature of mineral inclusions hosted in quartz: (i) HT1bt veins with inclusions of K-feldspar, biotite, rutile, and minor titanite and (ii) HT1px veins with inclusions of actinolite, augite, titanite, apatite, and minor rutile. Using an emplacement depth of the veins of between 2 and 3 km (500 to 800 bar), derived from the diatreme breccia architecture and the supposed erosion preceding the diatreme formation, multiple mineral thermobarometers are applied. The data indicate that HT1 veins were formed at temperatures > 700 °C. HT2 veins host assemblages of polyphase brine inclusions, generally coexisting with low-density vapor-rich inclusions, trapped at temperatures around 600 °C. Rhyolitic silicate melt inclusions found in both HT1 and HT2 veins represent melt droplets transported by the ascending hydrothermal fluids. LA-ICP-MS analyses reveal a chemical evolution coherent with the crystallization of an evolved rhyolitic melt. Quartz from both HT1 and HT2 veins also contains secondary, low-temperature (~ 300 °C) brine and aqueous fluid inclusions that record the cooling of the system. Both vein types are locally crosscut and/or reopened by a pre-diatreme polymetallic event consisting of pyrite, sphalerite with “chalcopyrite disease,” galena, chalcopyrite, tetrahedrite–tennantite, and minor quartz. LA-ICP-MS analyses of mineral and high-temperature fluid inclusions hosted in HT1 and HT2 veins and in situ secondary-ion mass spectrometry oxygen isotope analyses of vein quartz indicate a magmatic signature for the mineralizing fluids with no major meteoric water input and allow reconstruction of the source and chemical evolution of fluids that formed these porphyry-style veins as snapshots of the early and deep mineralizations at Cerro de Pasco. This detailed study of the porphyry-type mineralization hosted in clasts offers a unique opportunity to reconstruct the late magmatic and early hydrothermal evolutions of porphyry mineralization underlying the world-class Cerro de Pasco epithermal polymetallic (Zn-Pb-Ag-Cu-Bi) deposit.

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Acknowledgements

The present investigation was carried out with the support of the Swiss National Science Foundation (grant 200020_134872). Funding for the SwissSIMS facility was provided by the KIP 6 “CASA” to LPB. We thank Volcan Companía Minera S.A. for providing logistic support and geological data. We gratefully acknowledge Jean-Marie Boccard and Fabio Capponi for their help with sample preparation and XRF analyses. We are grateful to Celestine Mercer, Zoltan Zajacz, associate editor Frank Melcher, and an anonymous reviewer for their constructive comments which significantly improved the manuscript.

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  1. Bertrand Rottier

    Present address: Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany

  2. Markus Wälle

    Present address: CREAIT, CRC and CFI Services (CCCS), Bruneau Centre for Research and Innovation, Memorial University of Newfoundland, St. John’s, NL, A1C 5S7, Canada

Authors and Affiliations

  1. Department of Earth Sciences, University of Geneva, 1205, Geneva, Switzerland

    Bertrand Rottier, Kalin Kouzmanov, Vincent Casanova & Lluís Fontboté

  2. Institute of Mineralogy and Geochemistry, University of Lausanne, 1015, Lausanne, Switzerland

    Anne-Sophie Bouvier & Lukas P. Baumgartner

  3. Institute of Geochemistry and Petrology, ETH Zürich, 8092, Zürich, Switzerland

    Markus Wälle

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Rottier, B., Kouzmanov, K., Casanova, V. et al. Mineralized breccia clasts: a window into hidden porphyry-type mineralization underlying the epithermal polymetallic deposit of Cerro de Pasco (Peru). Miner Deposita 53, 919–946 (2018). https://doi.org/10.1007/s00126-017-0786-9

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